Technical Abstract: Leaves of Ipomoea carnea ssp. fistulosa (Convolvulaceae) with conspicuous, round, yellowish orange leaf spots measuring up to 8 mm diam were collected from a garden plant in Cabo Rojo, Miradero, Puerto Rico on 8 December 2004. . Uredinia and telia were observed in the symptomatic areas. The uredinia were aecioid, amphigenous but mainly hypophyllous, cupulate, and grouped in the round chlorotic leaf spots. The peridial cells measured 24-36 × 18-25 µm with walls 4-6 µm thick, the outer wall striate to verrucose and the inner wall verrucose. Urediniospores were catenulate, globoid to ellipsoid, sometimes narrow at the apex, and measured 28-36 × 20-30 µm. The urediniospore walls were colorless to yellowish, verrucose, 2-3 µm at sides and up to 15 µm at the apex. Telia were epiphyllous, in the same spots as the uredinia, rounded, chestnut brown and subepidermal,becoming erumpent. Teliospores measured 42-57 × 28-36 µm and were pale brown to cinnamon brown when young becoming chestnut brown at maturity. The teliospores were ellipsoid or oblong, rounded at top and bottom, with no constriction at the septum with walls verrucose, 3-4 µm at the sides and 5-7 µm at the septum and apex. Each teliospore had a pedicel that was colorless except pale brown close to the spore, and up 70 µm long and 10 µm thick and easily broken. The rust was identified as Puccinia puta. Puccinia puta has been reported from South America and Mexico on species of Ipomoea. Ipomoea carnea ssp. fistulosa is cultivated as an ornamental plant and widely distributed mainly in wet areas in the Americas from Argentina to Florida and Texas. This is the first report of P. puta in Puerto Rico.